Materials Literature
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We investigated experimentally the effect of the electron-beam irradiation on the level of the low-frequency 1/f noise in graphene devices. It was found that 1/f noise in graphene reduces with increasing concentration of defects induced by irradiation. The increased amount of structural disorder in graphene under irra…
Self-assembled nanodiamond-lipid hybrid particles (NDLPs) harness the potent interaction between the nanodiamond (ND)-surface and small molecules, while providing a mechanism for cell-targeted imaging and therapy of triple negative breast cancers. Epidermal growth factor receptor-targeted NDLPs are highly biocompatibl…
The electrostrictive effect was investigated in Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-xPT) relaxor ferroelectric crystal, a representative high performance piezoelectric material, with respect to orientation, temperature, and composition. The electrostrictive coefficients Q11C, Q12C, and Q44C of PMN-xPT (x = 0.25−0.37) crysta…
Magnesium–yttrium alloys show significantly improved room temperature ductility when compared with pure Mg. We study this interesting phenomenon theoretically at the atomic scale employing quantum-mechanical (so-called ab initio ) and atomistic modeling methods. Specifically, we have calculated generalized stacking fa…
The conserved Swift-Hohenberg equation with cubic nonlinearity provides the simplest microscopic description of the thermodynamic transition from a fluid state to a crystalline state. The resulting phase field crystal model describes a variety of spatially localized structures, in addition to different spatially exten…
Layer upon layer: A facile extended Stöber method has been developed for the synthesis of diverse metal–carbon spheres, which includes core–shell-structured Ag@carbon, rattle-type Ag,AgBr@meso-SiO2, and yolk–shell-structured Ag@carbon@meso-SiO2 (see figure).
We demonstrate a new thin-film graphene diode called a geometric diode that relies on geometric asymmetry to provide rectification at 28 THz. The geometric diode is coupled to an optical antenna to form a rectenna that rectifies incoming radiation. This is the first reported graphene-based antenna-coupled diode workin…
We report an effective way to fabricate mechanically strong and multifunctional polyimide (PI) nanocomposites using aminophenyl functionalized graphene nanosheet (APGNS). APGNS was successfully obtained through a diazonium salt reaction. PI composites with different loading of APGNS were prepared by in situ polymeriza…
We examine, by means of ab initio pseudopotential calculations, La2/3Sr1/3MnO3/SrTiO3 (LSMO/STO) heterojunctions in which one unit layer of La1−xSrxMnO3 (with 0<x<1) is inserted at the interface. The optimal interlayer doping x for a robust interface ferromagnetism is investigated by considering the ener…
In order to fully understand nanoscale heat transport it is necessary to spectrally characterize phonon transmission in nanostructures. Toward this goal we have developed a microfabricated phonon spectrometer. We utilize microfabricated superconducting tunnel junction (STJ)-based phonon transducers for the emission an…
We report a memristive switching effect in the Pt/CuOx/Si/Pt devices prepared by rf sputtering technique at room temperature. Different from other Cu-based switching systems, the devices show a non-filamentary switching effect. A gradual electroforming marked by resistance increasing and capacitance decreasing is obse…
Using pulsed laser deposition and a unique fast quenching method, we have prepared SrCoOx epitaxial films on SiTiO3 substrates. As electrochemical oxidation increases the oxygen content from x = 2.75 to 3.0, the films tend to favor the discrete magnetic phases seen in bulk samples for the homologous series SrCoO(3−n/8…
This paper presents a new, highly stable, periodic approximant to the Al-based F-type icosahedral quasicrystals, i-Al–Pd–TM (TM = transition metals). The structure of this intermetallic Al–Pd–Cr–Fe compound is determined ab initio using single-crystal X-ray diffraction, where the space group is identified to be Pa{\ov…
One of the major theoretical riddles in shear banding instabilities is the angle that the shear band chooses spontaneously with respect to the principal stress axis. Here we employ our recent atomistic theory to compute analytically the angle in terms of the characteristics of the Eshelby inclusion that models faithfu…
A fundamental understanding of chemical sensing mechanisms in graphene-based chemical field-effect transistors (chemFETs) is essential for the development of next generation chemical sensors. Here we explore the hidden sensing modalities responsible for tailoring the gas detection ability of pristine graphene sensors…
Learning to let go: Controlled release of cargo (purple cubes) from lectin (blue squares)-gated nanopores was achieved using mannose (green loops)-functionalized mesoporous silica (see scheme). The protein nanogates could be opened either by decreasing the pH of the buffer or by adding competing glucose (yellow rings)…
We calculated the formation energies of all simple point defects in cubic fluorite structured ${\mathrm{CeO}}_{2}$ using density functional theory within the GGA+$U$ approximation. All possible defect charge states were considered, and also polarons ${\mathrm{Ce}}_{\mathrm{Ce}}^{\ensuremath{'}}$ and associates of pola…
A new graphene-fullerene composite (rGO-pyrene-PCBM), in which [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) was attached onto reduced graphene oxide (rGO) via the noncovalent functionalization approach, was reported. The pyrene-PCBM moiety was synthesized via a facile esterification reaction, and pyrene was used…
The origin of superconductivity in bulk SrTiO 3 is a mystery since the nonmonotonous variation of the critical transition with carrier concentration defies the expectations of the crudest version of the BCS theory. Here, employing the Nernst effect, an extremely sensitive probe of tiny bulk Fermi surfaces, we show tha…
We show that N-doped ZnO films grown on sapphire can exhibit significant (∼1018 cm−3) room-temperature p-type behavior when sufficient nitrogen (N) is incorporated and the material is annealed appropriately. Substitutional N on the oxygen (O) sublattice is a deep acceptor; however, shallow acceptor complexes involve N…